CN1161117A - Method and apparatus for inbound channel selection in a communication system - Google Patents

Abstract

A system controller(102) is used in a communication system(100) which has a set of inbound channels. The system controller(102) includes a processing system(204) for generating a first message which is transmitted to selective call devices(106). The first message includes a subset identifier which identifies an ALOHA subset of the set of inbound channels for use by a set of the selective call devices(106). A selective call device(106) includes a transmitter(708) and a processing system(710). The processing system(710) identifies the ALOHA subset of the set of inbound channels, and generates a second message and couples the second message to the transmitter(708) using an ALOHA protocol on an inbound channel which is in the ALOHA subset of the set of inbound channels when the second message is a first type. The transmitter(708) transmits the second message.

Description

Apparatus for inbound channel selection in communication system

The present invention relates to multichannel communication system, be specifically related to select an inbound radio channel to utilize contention protocol to come message transfer.

Contain a plurality of selcalls and have the known technology that transmits inbound messages in the multichannel communication system of a plurality of inbound channels be utilize scheduled time table (scheduled) inbound host-host protocol technology and utilize the technology of the inbound host-host protocol of contention (non-scheduled time table).An example of the host-host protocol of scheduled time table is to keep a kind of host-host protocol of at least one predetermined time slot for used each selcall in the communication system at least on a predetermined inbound channel.Another example of the inbound host-host protocol of scheduled time table is a kind of host-host protocol that the notice selcall is used to a demand response time slot to transmit long inbound messages.This notice provides in outbound message, and the inbound messages that this outbound message is in response to a weak point that is sent by selcall is sent out, and has long inbound messages in order to notify this communication system.

An example of the inbound host-host protocol of contention is the ALOHA agreement, and this agreement is well-known to those skilled in the art.The inbound messages that sends according to the ALOHA agreement normally just is sent out once producing.When happening to be in, two such message are sent out on the channel and when some part was transmitted simultaneously, one or two message just might be received improperly.In this incident, two message can not confirmed that each selcall will repeat to send this message by communication system after a time delay at random.

Communication system can be wired, light or wireless communication system.Under the situation of wired communication system, each inbound channel can be separated with physically different circuits, perhaps can open (especially under the situation of various high speed wired systems) with the channel separation that limits bandwidth, or these two kinds of methods of dual-purpose is separated.Under light and situation wireless communication system, each channel is opened with the channel separation that limits bandwidth usually,, also can adopt time division multiplexing to come alternatively or additionally carries out channel separation.

Now design some and had the system of synchronous departures signaling protocol, selcall can be obtained and departures signaling protocol synchronised, because the inbound host-host protocol for scheduled time table for the inbound messages of the several types some demand responses and the affirmation is more effective than the inbound host-host protocol of contention usually, so adopted the inbound host-host protocol of scheduled time table.Yet such as some uncalled inbound messages, the contention host-host protocol normally efficiently for other inbound messages types.For this reason, be desirable to provide two types inbound host-host protocol.

The system of prior art uses the ALOHA agreement to transmit by the message of specifying some types usually and the message of other types uses the host-host protocol of scheduled time table to transmit, to provide the scheduled time mixing with inbound host-host protocol contention table.Selcall then uses the technology of appointment on the inbound channel of permission.The inbound channel of permission normally selcall designs upward arbitrary channel of employed each inbound channel.

Yet in some communication system, when adopting the ALOHA agreement to be used for inbound messages, some inbound channels are not so efficient.For example, in some radio communications system, some inbound radio channels (below be called " limited channel ") are limited on the region than in some littler districts of the departures radio channel area of coverage, and other inbound radio channel then has the area of coverage equivalent basically with the departures radio channel.Limited channel adopts the efficient of ALOHA agreement transmission inbound messages so not high, because selcall might be in the area of coverage of limited channel.

In view of the above, need a kind of improvement technology that is used to select inbound channel now, it adopts the ALOHA agreement to transmit inbound messages in communication system.

According to a first aspect of the invention, a kind of selcall is applied in the communication system.This communication system has an inbound channel collection.Selcall contains a transmitter and a treatment system.This transmitter sends first message.This treatment system is couple to this transmitter, be used to discern an ALOHA subclass of this inbound channel collection, and produce first message, and when first message is first type of message, adopt the ALOHA agreement that first message is coupled to transmitter on the inbound channel in the ALOHA of inbound channel collection subclass.

According to a second aspect of the invention, a kind of selcall is applied in the radio communications system.This selcall has an inbound channel collection.Selcall contains a transmitter and a treatment system.This transmitter sends first message.This treatment system is couple to this transmitter, be used to identify the ALOHA position partly of concentrated ALOHA subclass of inbound channel and concentrated each the ALOHA subclass of inbound channel, also identify the inbound channel in the ALOHA of inbound channel collection subclass, and produce first message, and when first message is first type of message, during the ALOHA of inbound channel part, adopt the ALOHA agreement that first message is coupled to transmitter.

According to a third aspect of the invention we, a kind of system controller is applied in the communication system.This communication system contains selcall and system controller.This communication system has an inbound channel collection.This system controller contains a treatment system, is used to produce first message, and this first message will send selcall to.This first message comprises a sub-set identifier, utilizes a group selection calling device to discern the ALOHA subclass of inbound Ji Daoji.

Fig. 1 is the electrical block diagram according to the radio communications system of the preferred embodiment of the present invention.

Fig. 2 is the electrical block diagram according to the system controller that is used for radio communications system of preferred and alternative embodiment of the present invention.

Fig. 3 is the characteristics timing diagram by the transformat of the employed departures signaling protocol of radio communications system according to preferred and alternative embodiment of the present invention.

Fig. 4 is according to the departures that are used for first kind radio communications system of the preferred embodiments of the present invention and the timing diagram of inbound channel radio signal.

Fig. 5 is according to the present invention preferably and the departures of the second type radio communications system of the embodiment that substitutes and the timing diagram of inbound channel radio signal.

Fig. 6 be according to the present invention preferably and a kind of subclass in order to the available inbound channel of identification selection call radio device in system controller of the embodiment that substitutes so that adopt the ALOHA technology to send the flow chart of the method for inbound messages.

Fig. 7 is according to the present invention preferably and the electrical block diagram of a kind of multichannel selective call radio device of the embodiment that substitutes.

Fig. 8 is a kind of flow chart in order to using method in the selective call radio device according to preferred and alternative embodiment of the present invention.

With reference to Fig. 1, the figure shows preferably and the electrical block diagram of the radio communications system 100 of the embodiment that substitutes according to the present invention.Radio communications system 100 comprises message input device, such as telephone set 101, facsimile machine 120 or the message terminal 122 of routine.They are couple on the system controller 102 through the telephone link 11 of routine by conventional public switch telephone network (PSTN) 168.System controller 102 is by the work of a plurality of radio frequency sending set/receivers 103 of one or more communication link 116 supervision, and link 116 is the pair twist telephone wire normally, also can comprise radio frequency (RF), microwave or other high quality speech communication link in addition.System controller 102 is inbound with each to become the form compatible mutually with land line message computer with the telephone address coding of departures with decoding.Encode in addition outbound message and be the function of its scheduled time table of system controller 102, this message can comprise such as simulated voice message, the alphanumeric message of numeral and the information the response command, so that send a plurality of selective call radio devices 106 to by radio frequency sending set/receiver 103.System controller 102 is deciphered the function of inbound messages in addition, and this message comprises uncalled message and the response message that is received by radio frequency sending set/receiver 103 from a plurality of selective call radio devices 106.

The predetermined example of the departures alphanumeric message of a selective call radio device 106 of giving is, from an alphanumeric beep-page message of message terminal 122 inputs.The predetermined example of the departures simulation message of a selective call radio device 106 of giving is, from a speech beep-page message of telephone set 101 inputs.The example of response message is acknowledge message and demand response message.Acknowledge message is an inbound messages that is sent by selective call radio device 106, and it shows and successfully receives an outbound message.Demand response message is a message that is sent by the selective call radio device, and it is in response to the order that is comprised from an outbound message of system controller 102.An example of demand response message is a text message that is started by selective call radio device 106, but text message is just to send after receiving a demand response order from system controller 102.After demand response message sends system controller 102 to from selective call radio device 106 a inbound messages asked for permission, the demand response order was sent by system controller 102.A demand response message is by the constantly transmission of selective call radio device 106 at 102 scheduled time tables of system controller, and specify in the departures requirement message, the ALOHA agreement that perhaps to adopt non-scheduled time table technology be time slot transmits demand response message, and this is known to those skilled in the art.When adopting the ALOHA agreement to transmit demand response, it is called as " demand ALOHA response message ".A uncalled message is not receive an inbound messages that sends under the outbound message situation that requires response by selective call radio device 106.An example of uncalled message is the inbound messages from a selective-calling radio device 106, and it warns radio communications system 100: this selective-calling radio device 106 is within the coverage of radio communications system 100.Uncalled message can comprise a request, i.e. what request sent scheduled time table is the response of demand, and this response can comprise data, for example alphanumeric data.Uncalled message adopts the ALOHA agreement of dividing time slot.Departures and inbound messages are included in the inbound radio signal of the departures radio signal of the conventional antenna that is connected with radio frequency sending set/receiver 103 104 transmissions and reception.

Please note, the transmission that system controller 102 can be operated in distribution controls environment down, this environment allow conventional honeycomb, with broadcast, satellite or other covering scheme mix, wherein comprise a plurality of radio frequency sending set/receivers 103, conventional antenna 104, in order in the geographic area at world wide networking, to provide reliable radio signal greatly.Even, as one skilled in the art will realize that, can the residing in the system controller 102 separately of phone with the selective-calling radio communication system functionality, system controller 102 can be worked independently, also can networking mode work.

Each selective-calling radio device 106 that assignment is used for radio communications system 100 has the address of at least one assignment to it, and this is the selective call address of a uniqueness.This selective call address makes the selective call radio device 106 that can only send institute's addressing from the message of system controller 102 to.

Be appreciated that, selective call radio device 106 be several types radio device one of them, they comprise bidirection pager, conventional mobile radio telephone with and on be connected to routine or the cluster mobile phone that has optional data terminal ability in data terminal or the design.Each selective call radio device 106 that assignment is used for radio communications system 100 has the address of an assignment to it, and this is the selective call address of a uniqueness.This selective call address makes the selective call radio device that can only send institute's addressing from the message of system controller 102 to, can also identify on system controller 102 from this selective call radio device received message and response.In addition, each among one or more selective call radio devices 106 can have the telephone number that its uniqueness is given in assignment, and this telephone number is unique in PSTN108.The selective call address of the assignment of selective call radio device and the table of phone numbers associated are stored in the system controller 102 with the form of customer data base.

With reference to Fig. 2, the figure shows electrical block diagram according to the system controller 102 of the preferred embodiments of the present invention.System controller 102 makes the speech information queuing of data and storage, so that be sent to selective call radio device 106, connect call, so that send selective call radio device 106 to, and receive affirmation, demand response, non-from selective call radio device 106 and call through the data of request and the speech information of storage.

System controller 102 comprises a mesh field controller 202, treatment system 204, outbound message 208, customer data bases 220 of storage and a telephony interface 206.Mesh field controller 202 is connected with the system receiver of fixing 107 (Fig. 1) with radio frequency sending set/receiver 103 (Fig. 1) by link 116.Mesh field controller 202 adopts one or more departures channels of message handling device function institute's scheduled time table, each outbound message that will comprise the selective call address sends emittor/receiver 103 to, and control transmitter/receiver 103 sends the wireless radio transmission circulation that contains outbound message.Mesh field controller 202 is also handled from the inbound messages of selective call radio device 106.Each inbound messages is received on an inbound radio channel collection by emittor/receiver 103 and fixed system receiver 107, and gives mesh field controller 202.Treatment system 204 comprises the message handling device function that is used to arrange route and processing messages, and is coupled to mesh field controller 202, telephony interface 206, customer data base 220 and outbound message memory 208.Telephony interface 206 is handled public switch telephone networks 108 (PSTN) physical connection (Fig. 1), so that connect and split off call on the telephone link, and arranges the audio signal route between telephone link 110 and the treatment system 204.

Customer data base 220 is coupled to treatment system 204, store each user's information, comprising the correlation between the employed telephone number in the selective call address of giving each selective call radio device 106 in assignment and the PSTN108, so that message and telephonic call are arrived each selective call radio device 106, and comprise some users that other determines right to choose, for example in which hour, to stop message to send selective call radio device 106 to.Outbound message memory 208 is in order to store queue message, their queuings send at least one in a plurality of selective call radio devices 106 to, wherein each message of this queuing message is associated with a selective call address, this address is predetermined to send each message in a plurality of selective call radio devices 106 some addresses, also is stored in the outbound message memory 208.

Simulation message was transformed to digital form by treatment system 204 before depositing outbound message memory 208 in.The function of message handling device is outbound message and the table of the selective call address scheduled time correspondingly, so that transmit in a transmission cycle period, if necessary, the each several part of message is arranged in some frames of transmission cycle period.As mentioned above, each message can be digital information, for example alphanumeric message, or analog information, for example speech.According to the preferred embodiment of the present invention, a transmission cycle period has one or more control frames, the numerical portion of a transmission cycle period utilizes the message handling device function to prepare to transmit, and the message handling device function is determined numeral that comprises in this transmission cycle and the selective call address of simulating the associated selective call radio device of message from customer data base 220.A simulation message is included in one or more analog frame.Because the normally one or more voice signals of analog information are so analog frame also is " Speech frame " in addition.

The message handling device function also identifies the inbound messages that is associated with one of selective call radio device in the customer data base 220, and identifies the response message that is associated with one of outbound message in the outbound message memory 208.As an example of system controller 102 work, the outbound message that transmission departures message memory 208 is stored is finished following the time: when promptly outbound message has been sent to preset selection call radio device 106; When the inbound affirmation that outbound message has been produced by selective call radio device 106 is confirmed; When outbound message occurs on the display screen of selective call radio device 106 of user operation; User's inbound messages is produced by a user and when selective-calling radio device 106 sends back system controller 102; And the response outbound message, when the inbound response of user has been discerned by user's message generation specifically and by the message handling device function.In this example, the message handling device function produces another message of giving the outbound message originator, and with the notice originator: this outbound message confirmed by selective call radio device 106, and by user's response of this selective call radio device 106.

System controller 102 is the transmission scheduled time table from the demand response of selective-calling radio device 106 and acknowledge message.In some cases, the scheduled time of inbound messages table, with such as non-scheduled time table used in the ALOHA system, import the accessible throughput of inbound channel organizational form at random and compare, improved the throughput of inbound channel.As described in detail below such, the inbound channel of scheduled time table can be the part of available total time in half-duplex single-frequency radio channel (the single radio carrier frequency is by inbound time sharing shared with the departures channel).Another kind of alternative scheme is, is different from the radio carrier frequency that has on the inbound channel of departures channel radio frequency, and the scheduled time inbound channel of table can be certain part of up duration, or up duration is whole.

The MPS 2000 that system controller is preferably produced by Motorola Inc. (Schaumburg Illinois) ^The type call terminal.Treatment system 204 preferably includes conventional computer system 212 and conventional big capacity storage media 214.Conventional computer system 212 preferably comprises a plurality of processors, for example the VME Sparc processor of being produced by Sun Microsystems company.These processors comprise the memory such as dynamic random access memory (DRAM), it is as the scratchpad memory in temporary transient the processing, for example as outbound message memory 208, in order to from 106 confirmations of receipt of selective call radio device, also make the message formatization that is sent to selective call radio device 106.The hard disk mass storage device that conventional big capacity storage media 214 is preferably conventional.Customer data base 220 preferably is stored in the conventional big capacity storage media 214.

Be appreciated that the computer system 212 of the routine that also can adopt other type, when needs are dealt with the processing requirements of treatment system 204, can also add the computer system 212 and the big capacity storage media 214 of other homotype or substituted type.

The function that treatment system 204 is finished has: above-mentioned message handling device function, and this is conventional; With the function of describing below with reference to Fig. 6, this is unique.Conventionally all carry out, and control by the batch processing instruction of being stored in the big capacity storage media 214 by the computer system 212 of routine with function uniqueness.Unique function is controlled by one group that adopts the conventional programming instrument to produce unique procedure code.Mesh field controller 202 and telephony interface 206 adopt MPS 2000 ^The conventional I/O of call terminal partly realizes.

Radio communications system 100 of the present invention preferably adopts on the departures channel of addressing digital massage and speech information and is similar to FLEX ^TMThe synchronous frame stucture of (Flexible High Speed Paging of Motorola Inc. (Schaumburg Illinois)).As mentioned above, adopt two types frame: control frame and Speech frame.Control frame is preferably used in control, addressing and transmits digital massage to selective-calling radio device 106.Speech frame is used to transmit simulated voice message to selective-calling radio device 106.Two types frame all equals standard FLEX on length ^TMFrame; Two kinds of frames all with standard FLEX ^TMSynchronously.This frame of two types is time-multiplexed on single forward channel.

With reference to Fig. 3, shown in the figure according to the transformat characteristic of Fig. 1 radio communications system 100 employed departures signaling protocols of preferred and alternative embodiment of the present invention with comprise the timing diagram of control frame 330 details.Control frame 330 classifies as digital frame 330 again.The departures signaling protocol is subdivided into the agreement part, promptly hours 310, cycle 320, frame 330 and 345, word group 340 and word 350.Per hour transmitting in 310 the nearly cycle of 15 unique identification of 4 minutes.Usually, per hour transmit whole 15 cycles 320.In each cycle 320, transmit the nearly frame of 128 unique identification of 1.875 seconds, comprising control frame 330 and analog frame 345.Usually, all 128 frames all transmit.The word group 340 of the unique identification of the synchronizing signal 331 of a lasting 115ms of transmission and 11 160ms in each control frame 330.Synchronizing signal 331 comprises first sync section 337, frame information word 338 and second sync section 339.Frame information word 338 comprises 21 information bits and 11 Parity Check Bits.During each word group of each control frame 330, the bit rate of per second 1600 bits (bps), 3200bps or 6400bps all can be used.During synchronizing signal 331, the bit rate of the word group 340 of each control frame 330 is sent to selective-calling radio device 106.When bit rate is 1600bps, in each word group 340, transmit the word 350 of the unique identification of 8 32 bits.For bit rate 3200bps or 6400bps, comprise the word of 16 unique identification and the word of 32 unique identification in each word group 340 respectively, each word has the bit of 32 unique identification.In each word, at least 11 bits are used for EDC error detection and correction, and 21 bits or less bit are used for information, and this form is that those skilled in the art are known.In some words, 15 bits are used for EDC error detection and correction, and 17 bits are used for information, and this form also is that this professional domain technical staff is known.Each bit in every word group 340 and each word 350 adopt this professional domain technical staff known technical method transmit with interleaving mode, to improve the error burst error correcting capability of agreement.

Information is contained in interior each control frame of information field, and it comprises: the system information in frame information word 338 and the word group information field (BI) 332; One or more selective calls address in the address field (AF) 333; One or more groups vector bag in the information field (IF) 335, short message bag and long message; And the unused word section 336 of wherein not having useful information.An aspect that is contained in the system information in the frame information word 338 is frame number and all issues.Week, issue was from 0 to 15 the number in each cycle 320 of sign.Frame number is from 0 to 127 a number of each frame 330 in the identification cycle 320.Word group information field 332 contains all existing information with 106 decodings of (promptly not at power down mode) selective-calling radio device during control frame 330, and this is called " overall information ".Each vector bag in the frame 330 internal information fields 335 and short message bag are corresponding at least one address in the address field 333 in the same frame 330.The long message of in the information field 335 each is corresponding at least one the vector bag in the information field 335 of at least one or a plurality of frame 330.The border of field 332,333,335,336 is by word 350 regulations, rather than by word group 340 regulations, and the length of field 332,333,335,336 is variable, depend on some factors, such as the quantity of information in the type of the system information that is comprised in the word group information field 332 and quantity, used address style and each message etc.In view of the above, the length of each of field 332,333,335,336 can be shorter than or be longer than word group 340.When the total length of other field 332,333,335 equaled 11 word groups 340, the length of unused word section 336 can be 0.Be intended for whole vector bags of the specific selective-calling radio device 106 that started by benchmark service and short message and preferably be arranged in each cycle 320 and transmit on the predetermined frame in the frame 330, do not allow this specific selective-calling radio device 106 to enter low-power consumption (not receiving) state in other image duration when not including to the short message of this specific selective-calling radio device 106 and vector bag with box lunch.Word group message segment 332 in frame O comprises following real time information: year, the moon, week, day, hour, divide and 1/8 minute.

Vector contains information, and this information specifies goes out the banner word by the long message of above-mentioned agreement part, also comprises radio channel information, and for example the frequency of radio channel, subchannel are for the skew of radio channel frequency.The original position of long message, short message or vector bag and the agreement position of length scale fixed length message, short message or vector bag.

When a selective-calling radio device 106 detects its address in frame 330, relevant vector bag or short message bag in these selective-calling radio device 106 processed frames 330.When the vector bag in the selective call radio device 106 decodings frame 330 corresponding with its selective call address, selective-calling radio device 106 directly receives and deciphers a long message or a simulation message in same frame 330 or another control frame 330 or analog frame 345.

With reference to Fig. 4, these timing diagram 400 expressions are according to the departures and the inbound channel radio signal of the radio communications system of the first kind of the preferred embodiment of the present invention.The departures channel wireless signal of telecommunication and inbound channel radio signal are time-multiplexed on same radio carrier frequency, during the departures part 420 of control frame 330, send departures channel radio signal, during the inbound part of control frame 330, send inbound channel radio signal.The agreement that the departures channel wireless signal of telecommunication adopts Fig. 3 to describe produces and sends.The inbound channel radio signal adopts conventional digital protocol to produce and sends, and it comprises sync section and has the information word of error protection.The inbound channel radio signal begins to send at time slot 440 boundaries.Control frame 330 shown in Figure 4 has control frame 330 and analog frame 345 (not illustrating among Fig. 4) before and afterwards, and it is to determine by sending the type of message that is produced from emittor/receiver 103 in proper order.The inbound part of control frame 330 comprises scheduled time matrix section 430 and ALOHA part 450.When a selective-calling radio device 106 sent inbound messages, this message was to locate to begin to send at one of periodicity time slot 440 of predetermined number, and this time slot 440 is every frame 330,345 period stipulations in the departures signaling protocol.

During departures part 420, the channel wireless signal of telecommunication that will set off sends to one or more selective-calling radio devices 106 from emittor/receiver 103.Synchronizing signal 331 (Fig. 3), word group information field 332 (Fig. 3), address field 333 (Fig. 3) all are expressed as a section 403 (Fig. 4) that departures part 420 begins to locate in the control frame 330.In the departures part 420 of control frame 330, send out a plurality of outbound messages 404,405, departures part 420 control frame 330 begin locate initially, finish at 402 places, departures/inbound border.Predetermined portions 430 is in the control frame 330 on such position, and it originates in departures/402 places, inbound border, ends at 431 places, scheduled time table/ALOHA border.Departures that send in the word group information field 332 of control frame 330/go into station identifier identifies the position of departures/inbound border 402 with respect to control frame 330 starting points 401 with the number of time slot 440.ALOHA part 450 is in the control frame 330 on such position, and it originates in 431 places, scheduled time table/ALOHA border, ends at the starting point 401 of next frame 330,345.The agreement that in the word group information field 332 of control frame 330, sends separate identifier with the number of time slot 440 identify scheduled time table/ALOHA border 431 for control frame 330 in the position on departures/inbound border.A plurality of predetermined response to 406,410,412,413,414 send with data cell, and each data cell extends on one or more time slots 440.For example, the scheduled time response 410 of table is 4 time slots 440, and the scheduled time response 412 of table is 5 time slots 440, and the response 413 of scheduled time table is 2 time slots 440.A plurality of scheduled times table 406,410,412,413,414 in each all by order 455 of one of selective-calling radio device 106 response and send, this finishes in one of outbound message 404,405.The response 410 of scheduled time table is two-partly to be sent simultaneously by the response 412 and 413 that selective-calling radio device 106 1 and other selective-calling radio device 106 send out scheduled time table.The response 410 of scheduled time table is overlapping with the response 412,413 of other scheduled time table in time example of response of scheduled time table.For example, arrange different selective-calling radio device 106 when system controller 102 and send scheduled time table response, and in them at least the expection of some parts will the overlapping situation of response of scheduled time table just can take place when separated emittor/receiver 103 receives at one time on different regions.

The time started of each outbound message 404 is defined as frame number, blocknumber and font size.Order 455 is contained in one or more outbound messages 404, one in the selective-calling radio device 106 is identified in the selective call address of passing through the selective-calling radio device 106 that identified, and identify response time of scheduled time table, in the inbound channel radio signal, send a scheduled time table response at this scheduled time table selective-calling radio device 106 that the response time identified, comprise a data unit in this scheduled time table response.Order 455 comprises the designated length of a data unit.Outbound message 404 can also comprise data 457, for example an alphanumeric information message.The time started of each scheduled time table response 406,410,412,413,414 is with respect to departures/inbound border 402 regulations.

In the radio communications system 100, the selective-calling radio device is used to receive and is used to send required synchronous and timing information during control frame 330 inbound parts during control frame 330 departures parts, determined by section 403 and outbound message 404.When selective call radio device 106 receives the departures radio signal, selective-calling radio device 106 is handled outbound message 404, it is contained in the departures radio signal, at this moment outbound message 404 comprises the selective call address of selective-calling radio device, thereby identifies the selective-calling radio device 106 of handling outbound message 404.When in outbound message 404 or in a plurality of outbound messages, receiving orders 455, and when being handled by selective-calling radio device 106, this selective-calling radio device 106 just sends one of response 406,410,412,413,414 of scheduled time table with the data unit length of system controller 102 appointment in order 455 with in the response time of the scheduled time table that order is arranged.Responding 406,410,412,413,414 arrow line from 404,405 to the scheduled time of outbound message table by the corresponding relation between the response 406,410,412,413,414 of the selective-calling radio device order 455 of being received in outbound message 404 of sign and the scheduled time table of the selective-calling radio device that comes tagging in by Fig. 4 shows, wherein, an example is a line 415, and the order 455 that this line is finished from outbound message 405 is connected to scheduled time table response 414.Another example is a line 416, and it is from being connected to one of response 406 of scheduled time table among Fig. 4 than the order of finishing the Zao control frame 330 of control frame shown in Figure 4 330 455 (Fig. 4 is not shown).Another example is a line 417, it shows from ordering 455 (Fig. 4 is not shown) to be connected to the response of a scheduled time table, wherein, order 455 is to finish in a departures control frame more Zao than departures control frame shown in Figure 4 330, and the response that the scheduled time is shown is in a control frame 330 slower than control frame shown in Figure 4.

With reference to Fig. 5,500 expressions of this timing diagram are according to the departures and the inbound channel radio signal of the second type radio communications system of preferred and alternative embodiment of the present invention.Departures channel radio signal is operated on first radio carrier frequency, sends during departures control frame 330.The inbound channel radio signal is operated in (promptly with departures channel wireless signal of telecommunication frequency division multiplexing) on second radio carrier frequency, sends during the inbound frame period 530.Adopt the agreement of describing among Fig. 3 to produce and send departures channel radio signal.Adopt conventional digital protocol to produce and send inbound channel radio signal, it comprises sync section and has the information word of error protection.The inbound channel radio signal begins to send at time slot 440 boundaries.The inbound frame period 530 comprises scheduled time matrix section 515 and ALOHA part 518.The frame 520 that is shown in departures control frame 330 back among Fig. 5 can be control frame 330 or analog frame 345.

Identical among 330 durations of control frame of the departures channel wireless signal of telecommunication and agreement part and top Fig. 3 to the description of control frame 330.Section 403 (Fig. 4), word group information field 332 (Fig. 3), address field 333 (Fig. 3) send at the place that begins of control frame 330 and frame 520, and section 403 comprises synchronizing signal 331 (Fig. 3).A plurality of outbound message 504,505 is sent in control frame by emittor/receiver 103.(outbound message also sends in unshowned other frame in frame 520 and Fig. 5.) the inbound frame period 530 begins at 502 places, inbound frame border, extends to next inbound frame border 502, comprises a plurality of time slots 440.Begin to measure from departures control frame 330, there is a shift time 525 on inbound frame border 502, and it is a constant, can get any number more than or equal to 0.The inbound frame period 530 is identified by the frame number identical with departures control frame 330, and shift time 525 is relevant with this control frame 330 that sets off.Predetermined portions 515 be in originate in inbound frame border 502 and end to be scheduled to/position on ALOHA border 510 on.ALOHA partly is in and originates in scheduled time table/ALOHA border 510 and end on the position on inbound frame border 502.Send a plurality of scheduled time table responses 506,507 by the data folk prescription during the matrix section 515 at the fixed time, each data cell extends on one or more time slots of each inbound frame periods 530 period stipulation.In a plurality of scheduled times table response 506,507 each is a radio signal, is that one of the selective-calling radio device by identifying sends in response to one in the outbound message 504,505.As above to first kind radio communications system 100 (but not shown among Fig. 5) described, scheduled time table response sends when can send out the part of other scheduled time table response by a selective-calling radio device 106 and other selective-calling radio device 106.

Each section 403 comprises synchronizing signal 331 (Fig. 3), it indicates outbound frame border 401, and for example including the information of describing by the number of time slot to the position on the shift time 525 on inbound frame border 502 and scheduled time table/ALOHA border 510, shift time can change in the numerical value above control frame 330 length that set off at 0 time slot.Outbound message 504,505 comprises one or more orders 455, and each order 455 identifies a selective-calling radio device, and includes the above information that first kind radio communications system 100 is described.The zero-time of each scheduled time table response 506,507 is stipulated with respect to inbound frame border 502.

In radio communications system 100, the selective-calling radio device receives and sends required synchronous and timing information during the inbound frame period 530 on departures control frame 330, determined by section 503 and outbound message 504.The work of selective-calling radio device 106 is identical with the work in the first kind radio communications system 100.The scheduled time table that is installed on the order 455 of receiving in the outbound message 504,505 and the selective-calling radio device that comes tagging by the selective-calling radio of sign responds the corresponding relation between 506,507, in Fig. 5, represent with the arrow line of 504,505 to the scheduled time of outbound message table response 506,507, wherein, an example is a line 513, it connects the order of finishing in the outbound message 505 455, arrives scheduled time table response 507.To be similar to example (but not shown among Fig. 5) mode that among Fig. 4 first kind radio communications system 100 is provided, produce order 455, come the response scheduled time table that wherein produces in the inbound channel frame that takes place after the departures channel frame of order 455 for next.

With reference to Fig. 6, the figure shows flow chart according to the present invention's method therefor preferably and in the system controller 102 of the embodiment that substitutes, be used to discern a subclass of the inbound channel that selective-calling radio device 106 can use, so that adopt the ALOHA technical method to transmit inbound messages.This method contains ALOHA channel control (ACC) function programming, unique in the treatment system 204 of system controller 102.As mentioned above, the ACC function is to be controlled by the unique combination of the conventional program of system controller 102 stored instruction.In step 605, adopt the ALOHA technical method to transmit a subclass of the inbound channel collection of message by 106 identifications of all selective-calling radio devices to allowing.This preferably adopts the input terminal that is coupled to system controller 102 to finish by the system maintenance personnel.The channel that permission is used by all selective-calling radio devices 106 normally can generally cover the inbound channel of a big geographic area of radio communications system 100, and those channels that do not allow all selective-calling radio devices 106 to use then are a fraction of inbound channels of those its area of radio coverage as radio communications system 100 total areas of coverage.As an example, the Systems Operator can increase one or two inbound channel temporarily, so that the reliable covering of conventional mesh to be provided.These channels are not suitable for being applied to all selective-calling radio devices 106 and carry out the ALOHA transmission, so they are not in the ALOHA channel subset that all selective call radio devices 106 can be used.After making or changing this identification of ALOHA subclass, system controller 102 just produces a departures general messages and is sent on step 610, send all selective-calling radio devices 106 in a control frame 330 to.This general messages is included in the word group information field 332; This general messages contains an identifier, in order to identify those channels in the ALOHA subclass.

In some cases, when inbound channel is not suitable for by 106 uses of all selective-calling radio devices, there is some selective-calling radio devices 106 can suitably allow their to use inbound channel to carry out ALOHA and transmits.As described above in conventional center occasion, an example of this situation is a kind of like this selective-calling radio device 106, and it is worked in an inbound channel area of coverage, but limited geographical is arranged.The selective-calling radio device 106 that suitably allows to be operated in the limited coverage area uses inbound channel, and this channel is limited ALOHA channel, is used for limited ALOHA and transmits.In step 615, identification can be used for one or more channels that limited ALOHA transmits, and preferably adopts an input terminal to carry out by the system maintenance personnel.When to after being suitable for channel subset that limited ALOHA transmits and making or change sign, produce an outbound message that sends selective-calling radio device 106 or one group of selective-calling radio device 106 in step 620, this outbound message comprises so inbound channel indication of identification.In step 625, system controller 102 sends an agreement and separates identifier in control frame 330, it identifies the position of part of ALOHA in each inbound channel and scheduled time matrix section, the identification of doing is used as inbound channel or limited ALOHA channel by arbitrary selective-calling radio device 106, and ALOHA transmits or limited ALOHA transmits to be used for.In step 630, system controller 102 is received an inbound messages, and it is to adopt the ALOHA agreement to send out on an inbound channel of identification on step 610 or 620.

With reference to Fig. 7, the figure shows electrical block diagram according to the multichannel selective-calling radio device 106 of the other preferred embodiment of the present invention.Selective-calling radio device 106 comprises an antenna 702 that is used to intercept and send radio signal.This antenna 702 is couple to conventional receiver 704, receives the intercept signal 703 as describing among top Fig. 3 therein.Comprise the non-required energy outside the filtering channel frequency in a usual manner in the reception, the signal that amplification filtering goes out carries out multifrequency and restituted signal 703 to signal 703.Receiver 704 by generation restituted signal 705, and give processing section 710.Receiver 704 also has the power control input end 707 of treatment system of being coupled to 710.Treatment system 710 is coupled to display 724, alarm device 722, audio frequency amplifier 726, transmitter 708 and one group of user's control knob 720.Transmitter 708 is connected with treatment system 710 with control signal channel 706 by modulation signal 713, and is connected to antenna 702.Audio frequency amplifier 726 is connected to loud speaker 728.Processor partly comprises microprocessor, random-access memory (ram) 712, read-only memory (ROM) 714 and the electrically erasable programmable ROM (EEPROM) 718 that is couple to modulus/converter (ADC) 711 and D/A converter (DAC) 715.Restituted signal is connected with ADC711.Treatment system 710 is coupled to transmitter by DAC715.ADC711 is transformed to digital signal with restituted signal from analog signal in a usual manner, so that handled by treatment system 710.When restituted signal is analog signal, adopt the conventional mould/transformation of variables technology such as adaptive difference pulse code (ADPCM) that analog signal is transformed to digital signal.The bit restore funcitons is a binary data with digital signal conversion in a usual manner.Synchronizing function obtains from the synchronizing signal 331 (Fig. 3) of frame 330,345 (Fig. 3) in the known mode of those skilled in the art and keeps bit, word, word group, frame and cycle and departures signaling protocol synchronised.The word decoder function of word group is deciphered out contained word 350 (Fig. 3) in the word group 340 of departures signaling protocol in the known mode of those skilled in the art.The embedding address character unification of being stored in address of being received in the address field 333 (Fig. 3) of departures signaling protocol and EEPROM718 causes, perhaps when receiving a general messages indication, the message handling device function is just deciphered the departures word to selective call device 106 in the known mode of those skilled in the art, and handles outbound message.For the outbound message that has been defined as being used for selective-calling radio device 106 by the consistent or overall designator in address, handle according to the outbound message content with according to the set pattern of operation of 720 groups of user's control knobs in a usual manner by the message handling device function.When outbound message comprises user profile, produce an alarm signal usually.Alarm signal is delivered to alarm device 722, a kind of among its normally audible and alarm device quiet sound.

When outbound message comprises alphanumeric or graphical information, information is presented on the display 724 on the determined times controlling 720 operations by one group of user in a usual manner by Presentation Function.When outbound message comprised the audio-frequency information of speech, message processing function was transformed to analog signal with voice signal, was coupled to loud speaker 728 by audio frequency amplifier 726, and amplifier 726 is amplifying signal in a usual manner.In response to one group of control user of 720 operation or treatment system 710 detected incidents, for example receive an outbound message or the appearance of the scheduled time in a day, produce inbound messages with usual manner with digital form by the inbound messages function.Adopt the agreement of describing among Fig. 4 and Fig. 5 to produce and the oppositely inbound messages of (inbound) channel of encoding, give DAC715, there inbound messages is transformed to the analog signal that transmitter 708 is modulated in the known mode of those skilled in the art.Conventional transmitter 708 produces radiofrequency signals, by antenna 702 it is launched.

RAM712, EEPROM718, ADC711 and DAC715 be conventional components preferably.ROM714 is the conventional components with unique mask program instruction set, and its part is carried out unique function described below.Processor 716 preferably is similar to the DSP56100 digital signal processor (DSP) that Motorola Inc. produces.Be appreciated that processor 716 also can adopt other similar processor, when the processing requirements of treatment system 710 needs, also can increase other homotype or veriform processor.Be further appreciated that the memory that also can adopt other type for ROM714 and RAM712, for example ultraviolet erasable PROM (UVEPROM) or (flash) ROM fast.Be further appreciated that the adjacent part that RAM712, EEPROM718, ADC711, DAC715 and ROM714 individually or in combination can be integrated into microprocessor 716.

The function of finishing by treatment system 710 comprise at least above-mentioned bit recover, synchronously, parts such as word group transliteration sign indicating number, Message Processing, demonstration, message control and inbound messages generation, these functions are conventional, also comprise other function of describing among following Fig. 8, they are unique.Conventionally carried out by microprocessor 716 with function uniqueness, it is the custom microprocessor of being controlled by the batch processing sign indicating number of being stored in the big capacity storage media 214.Unique function is by the procedure code control of the one group of uniqueness that adopts the conventional programming instrument to produce.

Be appreciated that, treatment system can additionally be realized and without microprocessor 716, will the conventional off-the shelf integrated circuit such as CMOS shift register, clock, gate circuit, counter, DAC, ADC and RAM be made up and realized routine described here and unique function, in addition, can additionally realize in order to the some or all of conventional off-the shelf integrated circuit of realizing treatment system with application-specific integrated circuit (ASIC).Be further appreciated that microprocessor 716 also can be a custom microprocessor, for example by a microprocessor in the 68 HC11 microprocessor series of Motorola Inc. (Schaumburg IL) production.

With reference to Fig. 8, the figure shows the method flow diagram that is used for selective-calling radio device 106 according to preferred and alternative embodiment of the present invention.This method is included in unique ALOHA channel of programming in the treatment system 710 of selective-calling radio device 106 and selects (ACS) function.Unique ACS function is controlled by the unique combination of the conventional program instruction of being stored in the treatment system 710.In step 805, recover one group of acquiescence ALOHA part giving tacit consent in ALOHA subclass and the inbound channel that inbound channel is concentrated the memory of treatment system 710 in selective-calling radio device 106, and one group of ALOHA part of the ALOHA subclass of initialization inbound channel collection and inbound channel.The ALOHA subclass of initialized inbound channel identifies the inbound channel that inbound channel is concentrated, they are used to send inbound messages by selective-calling radio device 106, these inbound messages adopt the ALOHA technology to send, receive updated information up to selective-calling radio device 106, stipulate or be added on the ALOHA subclass of inbound channel till.Determining that from the subclass of storage the technology of initialization ALOHA subclass is a routine techniques, is unique but adopt the ALOHA subclass of acquiescence.Acquiescence ALOHA subclass can be the arbitrary subclass from empty set (promptly not having allocated channel to be used for ALOHA transmits) to whole inbound channel collection.Usually, default set comprises a channel at least, allows unregistered selective-calling radio device 106 to adopt the ALOHA technical method to send registration request initiatively.Can be used for each inbound channel that ALOHA transmits in the system, the ALOHA partially-initialized collection of inbound channel identifies the predetermined/ALOHA boundary position (thereby identifying the ALOHA part) of this each inbound channel.The default set of the ALOHA part of inbound channel can be the scheduled time table/ALOHA position that is used for all inbound channels jointly, or is used for the numerical value of different being scheduled to of the several regulations/ALOHA position of each inbound channel or one group of inbound channel.Determine that from the default set of storage the technology of the ALOHA partially-initialized collection of inbound channel is conventional, but the use of the ALOHA part default set of inbound channel is unique.In step 810, selective-calling radio device 106 receives an outbound message that contains ALOHA subclass identifier, identifies the new ALOHA subclass that an inbound channel that is used by all selective-calling radio devices 106 in the system is gathered.ALOHA subclass identifier includes some bits of arranging routinely in word group information field 332, to identify one or more inbound channels.This message or a general messages, be identified in a new ALOHA subclass of using by all used selective-calling radio devices 106 in the system, or individual calling or generally call a selective call message of being type, identify the new ALOHA subclass in the limited inbound channel set, selective-calling radio device 106 for a group id uses, or uses for the selective-calling radio device 106 of only institute addressing.In step 813, the new subclass of treatment system 710 usefulness replaces the method for old subclass to upgrade the ALOHA subclass of being stored.Being appreciated that for allowing to be used for carrying out the alternative method that the subclass inbound channel of ALOHA transmission is discerned by selective-calling radio device 106, is adoptable equally.For example, because each channel or can or cannot be, so can discern to the subclass that does not allow the channel that ALOHA uses by each selective-calling radio device 106 as the ALOHA transmission.In another modification, the outbound message that identification can be used for (or being not useable for) ALOHA channel transmitted can only be indicated the change of ALOHA subclass, for example increases from this ALOHA subclass or leaves out a channel or several channel.In step 815, selective-calling radio device 106 receives an overall outbound message, and it comprises a scheduled time table/ALOHA boundary marking symbol (agreement separation identifier) of inbound channel.Scheduled time table/ALOHA the border 431 (Fig. 4) of scheduled time table/ALOHA boundary marking symbol sign inbound channel, the position of 510 (Fig. 5).This scheduled time table/ALOHA boundary marking symbol includes some bits of arranging routinely in the word group information field 332, with this boundary 431 (Fig. 4) of scheduled time table/ALOHA that identifies a channel and an inbound channel, the position of 510 (Fig. 5).The location storage on scheduled time table/ALOHA border 431,510 is in selective-calling radio device 106, and upgrade by the information in the general messages on step 820 by treatment system 710, the mode that is adopted is similar to the described mode of ALOHA subclass to the inbound channel collection.Be appreciated that, for being in all inbound channels in arbitrary ALOHA subclass in arbitrary selective-calling radio device 106, their scheduled time table/ALOHA border the 431, the 510th is by the default set of each ALOHA part or definite by the transmission of one or more scheduled time table/ALOHA boundary marking symbols.

In step 825, treatment system 710 produces an inbound messages.A kind of in the normally following type of this inbound messages: the affirmation message of the ALOHA response message of uncalled inbound messages, request, scheduled time table, the perhaps response of scheduled time table.The ALOHA response message of uncalled inbound messages and request is the first kind " ALOHA ", they are produced by treatment system 710, and on time slot that adopts the ALOHA technology to determine by treatment system 710 and inbound channel, send by transmitter 708, and the affirmation of scheduled time table and the response of preset time table are the response of " scheduled time table " of second type, they send according to the preset time table of being received in outbound message, this outbound message comprises the information of necessary scheduled time table, for example inbound channel identification, beginning time slot and data rate.Regularly, modulation and channel are selected by treatment system 710 controls.In step 830, the type of inbound messages is determined by treatment system 710.When the type of step 830 is " scheduled time table ", adopt preset time table inbound channel in the time slot of preset time table, to send inbound messages in step 855, this is to carry out during the preset time matrix section of inbound channel.When the type of step 830 is not " scheduled time table ", and when the Frequency Division Multiplexing system described in radio communications system 100 is Fig. 5, treatment system 710 is further determined, last ALOHA Channel Identifier in the outbound frame 330 or agreement are separated identifier and whether are had the frame number identical with inbound frame, produce inbound message and transmit in this inbound frame on step 835.When the outbound frame 330 of separating the identifier place when ALOHA Channel Identifier or the agreement of the last time of determining to be received has with the such identical frame number of the inbound frame that wherein produces inbound messages on step 830, then postpone the transmission of inbound messages in step 840, arrive up to next inbound frame 530 by treatment system 710.The outbound frame 330 of separating the identifier place when ALOHA Channel Identifier or the agreement of the last time of determining to be received does not have with wherein when step 835 produces the such identical frame number of the inbound frame of inbound messages, perhaps when message when step 840 postpones, then on step 845, select a inbound channel in the ALOHA subclass randomly by treatment system 710, then, in the ALOHA part 450,518 of the channel of selecting at random, adopt the ALOHA technical method on the time slot of determining by treatment system 710, to send inbound messages in step 850.For example, adopt the ALOHA technical method, begin to send inbound messages on a time slot with respect to this boundary 431,510 of scheduled time table/ALOHA, this time slot is to choose on the predetermined amount of time in the ALOHA time slot randomly in the known mode of those skilled in the art.

When the time division multiplex system described in radio communications system 100 is Fig. 4, step 835 and 840 can be deleted.

Another substitutes according to the present invention is used for the embodiment of the time division multiplex system described in Fig. 5, also can delete step 835 and 840.Under the situation of this another alternate embodiment, the inbound messages that adopts the ALOHA agreement to send is normally partly sent at the ALOHA of the frame 330 of message generation by selective-calling radio device 106.In this another embodiment of the present invention, inbound messages is to adopt the ALOHA agreement to send on the inbound frame 530 that produces message.The deficiency of this another embodiment is, in the described Frequency Division Multiplexing system of Fig. 5, when shift time 525 during less than duration of a frame 330,520,530, stipulated a predetermined maximum ALOHA part of inbound messages, to not send the change of border or subclass in the outbound message in the meantime, and selective-calling radio device 106 will not send ALOHA message before this.Though this is sending the problem of having been avoided partly sending at the non-ALOHA of message ALOHA message this image duration that changes, limited the ALOHA part less than whole inbound frame.

Be appreciated that, the improvement technology that the method and apparatus of above-mentioned uniqueness provides multi channel channel to select, these multichannels are the ALOHA transmission that are intended for use in having inbound messages in the radio communications system 100 of a plurality of inbound channels, and when being used for the system of some similitudes being arranged with described system, said method provides similar improvement with equipment, but these may be very different in others.Especially, it is radio system that this system need not, even can not be radio system.For example, in wired point-to-multipoint communication system with a plurality of selcalls and a plurality of inbound channel (for example a plurality of lines to), by adopting above-mentioned technical method, some inbound channels can be distributed to all selective call devices and be used for the ALOHA transmission, and other inbound channel is used for the transmission of scheduled time table.For example, each message of lacking than a certain regular length can specify in and carry out the ALOHA transmission on the ALOHA channel.

In addition, when communication system was radio communications system, need not was to adopt such as ReFLEX ^TMOr InFLEXion ^TMAgreement and so on FLEX ^TMThe radio communications system of serial protocols.Other agreement for example is used for ARDIS ^TMThe agreement of system also can provide function described here after revising.

Should find out now, a kind of method and apparatus is provided already, in having the communication system of a plurality of inbound channels, the selection of the ALOHA subclass by the used inbound channel of control selective call device can improve the throughput of inbound messages.

Claims (23)

1. method of in selcall, using, wherein this selcall is used for a communication system, and this communication system has an inbound channel collection, it is characterized in that, said method comprising the steps of:

Identify an ALOHA subclass of inbound channel collection; With

When first message is first type of message, on the inbound channel in the ALOHA of inbound channel collection subclass, adopts the ALOHA agreement to give and send first message.

2. according to the method for claim 1, it is characterized in that forwarding step also comprises the step of selecting inbound channel from the ALOHA subclass of inbound channel collection randomly.

3. according to the method for claim 1, it is characterized in that first type of message is a kind of among in the ALOHA response message of uncalled inbound messages and demand.

4. according to the method for claim 1, it is characterized in that this communication system is a radio system, and in described identification step, utilize the subclass identifier that in a frame of outbound message, receives to discern the ALOHA subclass.

5. according to the method for claim 1, it is characterized in that, in forwarding step, after its frame number inbound frame identical, during next inbound frame, send first message with the departures frame number of once receiving the subclass identifier.

6. according to the method for claim 1, it is characterized in that described identification step comprises that also the memory from this selcall recovers the step of collection of the silent approvement on the ALOHA subclass of silent approvement of inbound channel collection and scheduled time table/ALOHA border.

7. according to the method for claim 1, it is characterized in that described inbound channel has an ALOHA part; Wherein in described forwarding step, first message sends in the ALOHA of inbound channel part.

8. according to the method for claim 1, it is characterized in that selcall is a radio device.

9. method that is used for selcall, wherein this selcall is used for a radio communications system, and this radio communications system has an inbound channel collection, it is characterized in that, may further comprise the steps:

According to the subclass identifier, the position of the ALOHA part of each of the ALOHA subclass of identification inbound channel collection and the ALOHA subclass of inbound channel collection;

Be identified in an inbound channel in the ALOHA subclass of inbound channel collection; And

During an ALOHA part of inbound channel, adopt the ALOHA agreement to send first message.

10. selcall that is used for communication system, wherein this communication system has an inbound channel collection, it is characterized in that, and described selcall comprises:

A transmitter is in order to send first message; With

A treatment system is couple to described transmitter, wherein said treatment system:

An ALOHA subclass of identification inbound channel collection, and

Produce first message, when first message is first type of message, adopt the ALOHA agreement that first message is coupled to described sender on the inbound channel in the ALOHA of inbound channel collection subclass.

11. the selcall according to claim 10 is characterized in that, when treatment system produces first message, just selects inbound channel randomly from the ALOHA subclass of inbound channel collection.

12. the selcall according to claim 10 is characterized in that, first type of message is a kind of in the ALOHA response message of uncalled inbound messages and demand.

13. the selcall according to claim 10 is characterized in that, this treatment system produces second message, when second message is second type of message, utilizes a channel of inbound channel collection that second message is coupled to described transmitter.

14. the selcall according to claim 13 is characterized in that, this second type of message is a kind of in the response of the affirmation of scheduled time table and scheduled time table.

15. selcall according to claim 10, it is characterized in that, this communication system is a radio communications system, and described selcall also comprises a receiver, be coupled to described treatment system, in order to receive the subclass identifier, described treatment system identifies this ALOHA subclass according to this subclass identifier.

16., it is characterized in that after its frame number inbound frame identical with the departures frame number of once receiving the subclass identifier, during next inbound frame, treatment system is coupled to this transmitter with first message according to claim 15 selcall.

17. selcall according to claim 10, it is characterized in that, this selcall also comprises a memory, be couple to described treatment system, wherein said treatment system is from the ALOHA subclass of the silent approvement of memory recovery inbound channel collection and the silent approvement collection on scheduled time table/ALOHA border.

18. the selcall according to claim 10 is characterized in that, described inbound channel has an ALOHA part; Wherein said treatment system is coupling first message during the ALOHA of inbound channel part.

19. the selcall according to claim 10 is characterized in that, described selcall also comprises a radio receiver, and transmitter wherein is a radio transmitter.

20. a selcall that is used for radio communications system, wherein this selcall has an inbound channel collection, it is characterized in that, described selcall comprises:

A transmitter is in order to send first message; With

A treatment system is couple to described transmitter, wherein treatment system:

The position of the ALOHA part of each of the ALOHA subclass of identification inbound channel collection and the ALOHA subclass of inbound channel collection,

An inbound channel in the ALOHA subclass of identification inbound channel collection, and

Produce first message, when first message is first type of message, during the ALOHA of inbound channel part, adopt the ALOHA agreement, first message is coupled to described transmitter.

21. a system controller that is used for communication system is characterized in that communication system comprises selcall and system controller; Wherein communication system has an inbound channel collection, this system controller comprises: a treatment system, be used to produce first message, this first message is sent to this selcall, wherein first message contains a sub-set identifier, be used for a group selection calling device, in order to an ALOHA subclass of identification inbound channel collection.

22. system controller according to claim 21, it is characterized in that, described treatment system produces agreement and separates identifier, this agreement is separated identifier and is included in second message that sends to each selcall, wherein said agreement separate identifier identify the inbound channel collection the ALOHA subclass each the ALOHA part and the position of scheduled time matrix section.

23. the system controller according to claim 21 is characterized in that, described system controller also comprises a radio receiver; Wherein said transmitter is a radio transmitter.

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